Pls send the pic to *****@******.***
They will post it.
Anyway, from your description, I have reached a diagnosis. The picture should confirm it.
What you have is Herpes zoster or Shingles.
It is caused by the reactivation of Chicken pox virus which remains in a dormant stage within the nerve cells and come out along the skin supplied by a nerve branch. This is why it is one sided usually. It could cause severe pain and burning sensations. Some individuals, especially those above 40 years could experience pain in the affected area long after the rash is gone(post herpetic neuralgia).
Treated early(i.e, within 72 hours of the rash), Herpes zoster can be controlled with antiviral medications like acyclovir, famcyclovir or valacyclovir. After this period, as in your case, these medications are not going to be of much help.
Here is what you can do now, if you are not in a position to see a doctor immediately:
Apply Silver Sulfadiazine cream thrice daily to the rashes. This will dry the lesions within a week.
Take Ibuprofen 400 mg three times daily for the pain and swelling.
If there is sign of secondary bacterial infection in the area, you may need prescription antibiotics.
More on How To Manage Shingles
If you need further clarification, please ask. __________________________________
My answer is for your personal information only. It should not be used as a substitute to visiting your doctor. No treatment should be tried without first consulting a doctor.